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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-942) Improbe the way to process the missing value for DF.
Date Fri, 22 Jun 2012 10:48:42 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399255#comment-13399255
] 

Sean Owen commented on MAHOUT-942:
----------------------------------

Ikumasa do you have a patch for this?
                
> Improbe the way to process the missing value for DF.
> ----------------------------------------------------
>
>                 Key: MAHOUT-942
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-942
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Classification
>            Reporter: Ikumasa Mukai
>              Labels: DecisionForest
>
> If we process the data which contains the missing value("?"),
> the tree cannot be created because DataConverter.convert inserts the null value
> to the list of Instances.
> Of cause we can fix this issue with prohibiting DataConverter.convert insert
> the null value, but I notice that there is a potentiality that the rows
> which have missing value("?") can be also used to make the tree.
> We can use them for making all stems on the edge where we use the missing value.

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